Changes in the atmospheric helium isotope ratio over the past 40 years

Citeable URL: https://ir.library.oregonstate.edu/concern/articles/0c483m200

Descriptions

Attribute Name	Values
Creator	Lupton, J. Evans, L.
Abstract	We have compared the helium isotope ratio in five samples of Pacific marine air spanning the 40 year period between 1973 and 2013 against a secondary gas standard. In a separate experiment we directly compared the ³He/⁴He ratio in air samples collected in 1973 and 2013 at the same location in La Jolla, California, eliminating any geographical bias. Both experiments are consistent with zero time rate of change for atmospheric ³He/⁴He. Our best estimate for the rate of change of the ³He/⁴He ratio in Pacific marine air is -0.0014 ± 0.0045%/yr (2σ), indicating that air helium is still a valid standard for terrestrial helium isotope measurements. Keywords: natural gas, atmospheric, isotopes, helium, air
Resource Type	Article
DOI	https://doi.org/10.1002/2013GL057681
Date Available	2014-04-04T19:24:14+00:00
Date Issued	2013-12-03
Citation	Lupton, J., and L. Evans (2013), Changes in the atmospheric helium isotope ratio over the past 40 years, Geophysical Research Letters, 40, 6271–6275. doi:10.1002/2013GL057681
Journal Title	Geophysical Research Letters
Journal Volume	40
Journal Issue/Number	23
Rights Statement	Copyright Not Evaluated
Funding Statement (additional comments about funding)	This work was supported by the NOAA Earth Ocean Investigations Program (formerly the NOAA Vents Program). This is PMEL contribution 4047.
Publisher	American Geophysical Union
Peer Reviewed	Yes
Language	English [eng]
Replaces	http://hdl.handle.net/1957/47059